Effect of overglazed and polished surface finishes on the compressive fracture strength of machinable ceramic materials

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Author(s)

    • ASAI Tetsuya
    • Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences
    • KAZAMA Ryunosuke
    • Removable Partial Denture Prosthodontics, Department of Masticatory Function Rehabilitation, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University
    • OKIJI Takashi
    • Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences

Abstract

Controversy prevails over the effect of overglazing on the fracture strength of ceramic materials. Therefore, the effects of different surface finishes on the compressive fracture strength of machinable ceramic materials were investigated in this study. Plates prepared from four commercial brands of ceramic materials were either surface-polished or overglazed (<I>n</I>=10 per ceramic material for each surface finish), and bonded to flat surfaces of human dentin using a resin cement. Loads at failure were determined and statistically analyzed using two-way ANOVA and Bonferroni test. Although no statistical differences in load value were detected between polished and overglazed groups (<I>p</I>>0.05), the fracture load of Vita Mark II was significantly lower than those of ProCAD and IPS Empress CAD, whereas that of IPS e.max CAD was significantly higher than the latter two ceramic materials (<I>p</I><0.05). It was concluded that overglazed and polished surfaces produced similar compressive fracture strengths irrespective of the machinable ceramic material tested, and that fracture strength was material-dependent.

Journal

  • Dental Materials Journal

    Dental Materials Journal 29(6), 661-667, 2010-11-01

    The Japanese Society for Dental Materials and Devices

References:  38

Codes

  • NII Article ID (NAID)
    10026962541
  • NII NACSIS-CAT ID (NCID)
    AA10443149
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    02874547
  • DOI
    10.4012/dmj.2010-029
  • Data Source
    CJP  J-STAGE 
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